Ichigeki Sacchuu!! HoiHoi-san (PS2) - Final boss

In this battle, you fight Combat-san, an advanced housemaid mini-robot. HoiHoi-san also had an anime, if you're interested.
The song reminds me of Megaman 7 for some reason.
If you're wondering why the energy bar goes down without taking damage, it's because it's a time limit of sorts - taking damage just makes it go faster.